"Learning curves" of cardiac surgery in relation to risk stratification and hospital location.
D000704:Analysis of Variance; D006348:Cardiac Surgical Procedures / Q000193:education* / Q000401:mortality; D002309:Cardiology / Q000193:education*; D002983:Clinical Competence; D016304:Hospitals, Private / Q000706:statistics & numerical data*; D006785:Hospitals, University / Q000706:statistics & numerical data*; D006801:Humans; D007362:Intensive Care Units / Q000706:statistics & numerical data; D007902:Length of Stay; D011300:Preoperative Care / Q000379:methods; D011446:Prospective Studies; D012307:Risk Factors; D012720:Severity of Illness Index